Excel stores dates as sequential serial numbers so that they can be used in calculations. Enter your due dates in column A. For example, the Julian Day Number is seven digits long with the first four digits of the number representing the year and the last three the day of the year.
For example, DATE ,1,35 returns the serial number representing February 4,which is four days after January 31, You can add or subtract a number of days to or from a date by using a simple formula, or you can use worksheet functions that are designed to work specifically with dates in Excel.
Excel DATE formula to return a date based on values in other cells The DATE function is very helpful for calculating dates where the year, month, and day values are stored in other cells. In the following example, you'll see how to add and subtract dates by entering positive or negative numbers.
This number represents the seventh day of the year or January 7, More examples To add years to or subtract years from a date Start Date.
When using this date system, the DATE function will not display dates prior to